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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vavilov</journal-id><journal-title-group><journal-title xml:lang="ru">Вавиловский журнал генетики и селекции</journal-title><trans-title-group xml:lang="en"><trans-title>Vavilov Journal of Genetics and Breeding</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2500-3259</issn><publisher><publisher-name>Institute of Cytology and Genetics of Siberian Branch of the RAS</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18699/vjgb-25-71</article-id><article-id custom-type="elpub" pub-id-type="custom">vavilov-4750</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МЕДИЦИНСКАЯ ЦИТОГЕНОМИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MEDICAL CYTOGENOMICS</subject></subj-group></article-categories><title-group><article-title>Исследование мейотической сегрегации хромосомы 7 с парацентрической инверсией в сперматозоидах гетерозиготного носителя</article-title><trans-title-group xml:lang="en"><trans-title>Study of the meiotic segregation of chromosome 7 with a paracentric inversion in spermatosoa of a heterozygous</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0006-7684-6434</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Антонова</surname><given-names>М. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Antonova</surname><given-names>M. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><email xlink:type="simple">masha-antonova-1999@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5934-5551</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Юрченко</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Yurchenko</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2941-2861</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Маркова</surname><given-names>Ж. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Markova</surname><given-names>Zh. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0641-1084</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шилова</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Shilova</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Медико-генетический научный центр им. академика Н.П. Бочкова<country>Россия</country></aff><aff xml:lang="en">Bochkov Research Centre for Medical Genetics<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>04</day><month>09</month><year>2025</year></pub-date><volume>29</volume><issue>5</issue><fpage>652</fpage><lpage>657</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Антонова М.М., Юрченко Д.А., Маркова Ж.Г., Шилова Н.В., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Антонова М.М., Юрченко Д.А., Маркова Ж.Г., Шилова Н.В.</copyright-holder><copyright-holder xml:lang="en">Antonova M.M., Yurchenko D.A., Markova Z.G., Shilova N.V.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vavilov.elpub.ru/jour/article/view/4750">https://vavilov.elpub.ru/jour/article/view/4750</self-uri><abstract><p>   Парацентрическая инверсия (ПаИ) – это редкая сбалансированная внутрихромосомная структурная перестройка. Хотя гетерозиготные носители ПаИ обычно не имеют клинически значимых аномалий фенотипа, факт присутствия в кариотипе хромосомы с инвертированным сегментом предопределяет проблемы синапсиса и рекомбинации в мейозе у таких индивидов и приводит к формированию рекомбинантных хромосом с хромосомным дисбалансом. Риск рождения больного ребенка для носителей ПаИ из-за производства несбалансированных гамет в результате мейотической рекомбинации считается низким. Однако были описаны случаи рождения ребенка с нарушением интеллектуального развития и/или пороками развития; случаи спонтанных абортов, бесплодия у носителей из-за классической рекомбинации в инвертированном хромосомном сегменте. ПаИ могут быть сформированы на различных хромосомах. Показано, что у человека одной из частых среди парацентрических инверсий является ПаИ с локализацией точек разрыва в длинном плече хромосомы 7. С целью оценки мейотического поведения хромосомы 7 с парацентрической инверсией в длинном плече и эмпирического риска формирования гамет с рекомбинантными хромосомами проведено молекулярно-цитогенетическое исследование клеток эякулята у мужчины – гетерозиготного носителя ПаИ хромосомы 7 − inv(7)(q11.23q22). Рекомбинантные хромосомы 7 обнаружены с частотой 0.7 % и в гаметах представлены суммарно реципрокными продуктами разрыва дицентрической хромосомы 7. Сперматозоиды с дицентрической хромосомой 7 не обнаружены, что подтверждает факт нестабильности этой хромосомы в мейозе I у носителя данной парацентрической инверсии. Показано, что мейотическая сегрегация у гетерозиготного носителя inv(7)(q11.23q22) проходит с преимущественным формированием гамет с инвертированной и интактной хромосомой 7 с частотой 52.2 и 47.8 % соответственно. Впервые получены сведения о частоте формирования гамет с рекомбинантными хромосомами при мейотической сегрегации inv(7)(q11.23q22), что подтверждает факт наличия кроссинговера в инверсионной петле. Персонализированный риск формирования гамет (зигот) с дисбалансом материала хромосомы 7 у гетерозиготного носителя данной инверсии является низким.</p></abstract><trans-abstract xml:lang="en"><p>   A paracentric inversion (PAI) is a rare type of balanced intrachromosomal structural rearrangement. Heterozygotes for PAI are usually phenotypically normal, but the presence of the inversion may occasionally lead to synapsis and recombination disruptions during meiosis. PAI can be responsible for the production of recombinant chromosomes and unbalanced gametes. The risks associated with the birth of a child with chromosomal imbalances due to the generation of unbalanced crossover gametes is considered to be low. Nonetheless, viable offspring with intellectual disabilities and/or congenital abnormalities, as well as early miscarriages, stillbirth and infertility in heterozygous carriers of PAI have been described. Paracentric inversions may arise on various chromosomes. PAI with breakpoints on the long arm of chromosome 7 is among the most prevalent ones in humans. To assess the meiotic behavior of abnormal chromosome 7, as well as the empirical risk of producing gametes with recombinant chromosomes, the sperm FISH analysis of a male heterozygous carrier of inv(7)(q11.23q22) was performed. The percentage of recombinant sperms was 0.7 % and chromosomal imbalance was represented as reciprocal breakage products of a dicentric chromosome 7. Notably, spermatozoa with a dicentric chromosome 7 were not observed, which confirms its instability during meiosis I. Meiotic segregation analysis in the heterozygous carrier of inv(7)(q11.23q22) revealed a predominant formation of gametes containing either the inverted or the intact chromosome 7, occurring at frequencies of 52.2 and 47.8 %, respectively. This report is the first study providing a detailed description of meiotic segregation patterns of inv(7)(q11.23q22) by using a sperm FISH approach. Recombinant gamete formation confirms the occurrence of crossing-over within the inversion loop. Consequently, the individual risk of generating gametes (and subsequent zygotes) with chromosome 7 imbalance for this heterozygous carrier remains low.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>парацентрическая инверсия</kwd><kwd>хромосома 7</kwd><kwd>FISH сперматозоидов</kwd><kwd>мейотическая сегрегация</kwd><kwd>рекомбинантные хромосомы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>paracentric inversion</kwd><kwd>chromosome 7</kwd><kwd>sperm FISH</kwd><kwd>meiotic segregation</kwd><kwd>sperm recombinant chromosomes</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Anton E., Blanco J., Egozcue J., Vidal F. Sperm studies in heterozygote inversion carriers : a review. Cytogenet Genome Res. 2005;111(3-4): 297-304. doi: 10.1159/000086903</mixed-citation><mixed-citation xml:lang="en">Anton E., Blanco J., Egozcue J., Vidal F. 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